<!DOCTYPE html>
<html>
<head>
	<title>导出Excel</title>
	<meta charset="utf-8">
	<script src="/base/node_modules/xlsx/dist/xlsx.full.min.js"></script>
	<script>
        var jsono = [{ //测试数据
            "商品描述": "Description",
            "保质期禁售(天)": "lockupLifecycle",
            "商品名称": "skuName",
            "商品简介": "brief",
            "宽(cm)": "width",
            "阿达": "asdz",
            "货号": "goodsNo",
            "商品条码": "skuNo",
        },{ //测试数据
            "商品描述": "Description",
            "保质期禁售(天)": "lockupLifecycle",
            "商品名称": "skuName",
            "商品简介": "brief",
            "宽(cm)": "width",
            "阿达": "asdz",
            "货号": "goodsNo",
            "商品条码": "skuNo",
        }];
        var jsono = [ //建议使用结构
            ["保质期临期预警(天)","商品标题","建议零售价","高(cm)"],
            ["adventLifecycle","title","defaultPrice","height"],
            ["adventLifecycle1","title1","defaultPrice1","height1"],
            ["adventLifecycle2","title2","defaultPrice2","height2"],
            ["adventLifecycle3","title3","defaultPrice3","height3"],
        ];
        var tmpDown; //导出的二进制对象
        function downloadExl(json, type) {
            var tmpdata = json[0];
            json.unshift({});
            var keyMap = []; //获取keys
            //keyMap =Object.keys(json[0]);
            for (var k in tmpdata) {
                keyMap.push(k);
                json[0][k] = k;
            }
          var tmpdata = [];//用来保存转换好的json 
                json.map((v, i) => keyMap.map((k, j) => Object.assign({}, {
                    v: v[k],
                    position: (j > 25 ? getCharCol(j) : String.fromCharCode(65 + j)) + (i + 1)
                }))).reduce((prev, next) => prev.concat(next)).forEach((v, i) => tmpdata[v.position] = {
                    v: v.v
                });
                var outputPos = Object.keys(tmpdata); //设置区域,比如表格从A1到D10
                var tmpWB = {
                    SheetNames: ['mySheet'], //保存的表标题
                    Sheets: {
                        'mySheet': Object.assign({},
                            tmpdata, //内容
                            {
                                '!ref': outputPos[0] + ':' + outputPos[outputPos.length - 1] //设置填充区域
                            })
                    }
                };
                tmpDown = new Blob([s2ab(XLSX.write(tmpWB, 
                    {bookType: (type == undefined ? 'xlsx':type),bookSST: false, type: 'binary'}//这里的数据是用来定义导出的格式类型
                    ))], {
                    type: ""
                }); //创建二进制对象写入转换好的字节流
            var href = URL.createObjectURL(tmpDown); //创建对象超链接
            document.getElementById("hf").href = href; //绑定a标签
            document.getElementById("hf").click(); //模拟点击实现下载
            setTimeout(function() { //延时释放
                URL.revokeObjectURL(tmpDown); //用URL.revokeObjectURL()来释放这个object URL
            }, 100);
        }

        function s2ab(s) { //字符串转字符流
            var buf = new ArrayBuffer(s.length);
            var view = new Uint8Array(buf);
            for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
            return buf;
        }
         // 将指定的自然数转换为26进制表示。映射关系：[0-25] -> [A-Z]。
        function getCharCol(n) {
            let temCol = '',
            s = '',
            m = 0
            while (n > 0) {
                m = n % 26 + 1
                s = String.fromCharCode(m + 64) + s
                n = (n - m) / 26
            }
            return s
        }
    </script>
</head>
<body>
	<button onclick="downloadExl(jsono)">导出</button>
    <!--
            以下a标签不需要内容
        -->
    <a href="" download="这里是下载的文件名.xlsx" id="hf"></a>
    
</body>
</html>